H.M.S. Guardian at Penarth Dock - April 1959 - Built in 1932 specifically for anti-submarine net-laying duties with the Royal Navy. A large vessel at 338 feet long and with her beam of 53 feet she had a mere 7 feet to spare whilst manoeuvring through the locks at Penarth Dock.

H.M.S. Atherstone (L 05) - A type-1 Hunt-class destroyer launched in late 1939 at the Cammell Laird shipyard at Birkenhead on the River Mersey. She was moth-balled at Penarth Dock in the years 1953 - 1957.

H.M.S. Zodiac (R 54) - A Z-class destroyer which formed part of the Reserve Fleet at Penarth Dock during which time she was refitted at Penarth in 1954 and laid-up at Cardiff Docks. She was sold to the Israeli Navy and served them in the years 1956 - 1970.